From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
To: Johnny Chuang <johnny.chuang.emc@gmail.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Peter Hutterer <peter.hutterer@who-t.net>,
lkml <linux-kernel@vger.kernel.org>,
"open list:HID CORE LAYER" <linux-input@vger.kernel.org>,
Harry Cutts <hcutts@chromium.org>,
Johnny Chuang <johnny.chuang@emc.com.tw>,
James Chen <james.chen@emc.com.tw>,
Jennifer Tsai <jennifer.tsai@emc.com.tw>,
Paul Liang <paul.liang@emc.com.tw>,
Jeff Chuang <jeff.chuang@emc.com.tw>,
Douglas Anderson <dianders@chromium.org>,
Jingle <jingle.wu@emc.com.tw>
Subject: Re: [PATCH v3] HID: i2c-hid: Skip ELAN power-on command after reset
Date: Fri, 7 May 2021 15:38:36 +0200 [thread overview]
Message-ID: <CAO-hwJL1RFXDTHaMj+rHrERBMhNhYv57TBM1VSoTx2a4OA25NQ@mail.gmail.com> (raw)
In-Reply-To: <1618276850-27178-1-git-send-email-johnny.chuang.emc@gmail.com>
Hi Johnny,
Apologies fo the delay.
When I first saw your patch I wondered why we need a special case for Elan.
But then, we need a special case for SIS, as mentioned by
43b7029f475e. Given that this patch was in for a year and a half, and
not many people seemed to complain about it, I decided to apply your
patch.
On Tue, Apr 13, 2021 at 3:21 AM Johnny Chuang
<johnny.chuang.emc@gmail.com> wrote:
>
> Fixes: 43b7029f475e ("HID: i2c-hid: Send power-on command after reset").
As requested per Doug, I have moved that Fixes tag at the end, though
I forgot to remove the extra '.' at the end :-(
>
> For ELAN touchscreen, we found our boot code of IC was not flexible enough
> to receive and handle this command.
> Once the FW main code of our controller is crashed for some reason,
> the controller could not be enumerated successfully to be recognized
> by the system host. therefore, it lost touch functionality.
>
> Add quirk for skip send power-on command after reset.
> It will impact to ELAN touchscreen and touchpad on HID over I2C projects.
>
> Signed-off-by: Johnny Chuang <johnny.chuang.emc@gmail.com>
> ---
> Changes in V3:
> - intent the comment at qurik entry
> - add Fixes:flag for previous commit id
>
> Changes in v2:
> - move comment to quirk entry
> ---
> drivers/hid/i2c-hid/i2c-hid-core.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
> index 9993133..32e3287 100644
> --- a/drivers/hid/i2c-hid/i2c-hid-core.c
> +++ b/drivers/hid/i2c-hid/i2c-hid-core.c
> @@ -45,6 +45,7 @@
> #define I2C_HID_QUIRK_BOGUS_IRQ BIT(4)
> #define I2C_HID_QUIRK_RESET_ON_RESUME BIT(5)
> #define I2C_HID_QUIRK_BAD_INPUT_SIZE BIT(6)
> +#define I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET BIT(7)
>
>
> /* flags */
> @@ -178,6 +179,12 @@ static const struct i2c_hid_quirks {
> I2C_HID_QUIRK_RESET_ON_RESUME },
> { USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_LEGION_Y720,
> I2C_HID_QUIRK_BAD_INPUT_SIZE },
> + /*
> + * Sending the wakeup after reset actually break ELAN touchscreen controller
> + * Add I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET to skip wakeup after reset
I removed that extra second line.
Also added Cc: stable, and pushed to for-5.13/upstream-fixes
Cheers,
Benjamin
> + */
> + { USB_VENDOR_ID_ELAN, HID_ANY_ID,
> + I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET },
> { 0, 0 }
> };
>
> @@ -461,7 +468,8 @@ static int i2c_hid_hwreset(struct i2c_client *client)
> }
>
> /* At least some SIS devices need this after reset */
> - ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
> + if (!(ihid->quirks & I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET))
> + ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
>
> out_unlock:
> mutex_unlock(&ihid->reset_lock);
> --
> 2.7.4
>
prev parent reply other threads:[~2021-05-07 13:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-13 1:20 [PATCH v3] HID: i2c-hid: Skip ELAN power-on command after reset Johnny Chuang
2021-04-13 17:29 ` Harry Cutts
2021-04-14 15:28 ` Doug Anderson
2021-04-23 7:54 ` Johnny.Chuang
2021-05-07 8:44 ` Johnny.Chuang
2021-05-07 13:38 ` Benjamin Tissoires [this message]
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